Collapsing device of a desk

ABSTRACT

A collapsing device for a desk includes a main frame provided with two longitudinal rods respectively disposed with projections and a pivotal hole. Two guide frames are respectively fixed at opposite upper corners of a front plate and bored with a through channel extending backward and slanting upward to correspond with the pivotal hole. Two pivotal wheels are respectively received in the guide frames and actuated to shift therein, and two leg frames are pivotally assembled between the rear side of the front plate and the guide frames, respectively having an upper side bored with plural fitting slots. Thus, when the longitudinal rods are pivotally turned downward or upward by the pivotal wheels, with the projections of the longitudinal rods respectively fitted in or pulled out of the fitting slots of the leg frames, the desk can be stretched or collapsed.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a collapsing device of a desk, particularly toone simple in structure, and able to be stretched and collapsed quicklywithout using any tool. And after collapsed, the whole desk is stableand small in volume, convenient to be packaged, transported and stored.

2. Description of the Prior Art

Generally, a conventional fixed OA desk formed by welding joint is hugein volume and impossible to be collapsed, taking too much space and hardto be packaged, stored and transported. In view of this drawback, acombined desk, which is made by combining various components together bymeans of screws, has been developed and employed. However, when such acombined desk is to be made on an assembly line or by a consumerhimself, a tool like a screwdriver has to be used for carrying outassembly work smoothly, and it will take a long time to perform assemblyor disassembly of the desk, resulting in much inconvenience. Therefore,most desks of today are designed to be collapsible; nevertheless, thecollapsing mode of such conventional desk is only to make the top plateof the desk stand upright for storing, or have the top plate positionedhorizontally for use, but letting the legs of the desk still kept in afixed structure (either welded or assembled) and keeping the desk in aninverted T shape after collapsed, thus still taking much space inpackaging, storing and transporting. Although such a conventionalcollapsible desk can be collapsed for storing and stretched for use, yetits components are numerous and heavy, increasing producing cost andcausing trouble in assembly. In reality, the development of collapsibledesks does not yet attain perfection and hence it is necessary toresearch and develop such collapsible desks that are simple instructure, light and efficient, and able to be quickly assembled ordisassembled without using any tool.

SUMMARY OF THE INVENTION

The objective of this invention is to offer a collapsing device for adesk, which includes a main frame, two guide frames, two pivotal wheelsand two leg frames combined together.

The main frame to be secured at the underside of a desk top plate isprovided with two longitudinal rods respectively having a bottom sidefixed thereon with a plurality of engage projections and an outer frontend bored with a pivotal hole.

The two guide frames are respectively disposed at the opposite uppercorners of a front plate, respectively formed with a U-shaped bodyhaving an inner side bored with a through channel extending backward andslanting upward to correspond with the pivotal hole of the main frame.

The two pivotal wheels are respectively employed to pivotally connectthe guide frames and the longitudinal rods of the main frame, receivedin the guide frame and actuated to shift and operate therein.

The two leg frames are pivotally assembled between the rear side of thefront plate and the guide frames by means of hinges, respectively havingan upper side bored with a plurality of fitting slots to be respectivelyfitted in by the projections of the two longitudinal rods of the mainframe.

Thus, with the hinges serving as pivots, the two leg frames canrespectively be stretched outward along the front plate to have theprojections of the two longitudinal rods respectively fitted in thefitting slots of the leg frames, letting the two leg frames support thetwo longitudinal rods and the main frame together with a desk top plateto finish assembling a stable desk. When the longitudinal rods togetherwith the main frame is pivotally turned upward and moved backward alongthe channels of the guide frames, the longitudinal rods will be movedaway from the leg frames. At this time, the two leg frames can becollapsed inward and superposed on the rear side of the front plate, andthen the longitudinal rods are pivotally moved downward again to let themain frame together with desk top plate superposed on the two leg framesto finish collapsing the desk.

To sum up, the collapsing device for a desk in the present invention issimple in structure and able to be stretched and collapsed quickly andconveniently, needless to use any tool for assembling or disassembling,able to greatly diminish the volume of a desk after collapsed andconvenient to be packaged, transported and stored.

BRIEF DESCRIPTION OF DRAWINGS

This invention will be better understood by referring to theaccompanying drawings, wherein:

FIG. 1 is an exploded perspective view of a collapsing device of a deskin the present invention;

FIG. 2 is a front view of the collapsing device of a desk in the presentinvention;

FIG. 3 is a side view of the collapsing device of a desk to be collapsedin the present invention;

FIG. 4 is a rear view of the collapsing device of a desk in a halfcollapsed condition in the present invention; and

FIG. 5 is a perspective view of the collapsing device of a deskcompletely collapsed in the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of a collapsing device of a desk in the presentinvention, as shown in FIG. 1, includes a main frame 1, two guide frames2, two pivotal wheels 3 and two leg frames 4 combined together.

The main frame 1 secured at the underside of a desk top plate 5 isprovided with two longitudinal rods 11 respectively having a bottom sidefixed thereon with a plurality of projections 12, and an outer front endrespectively bored with a pivotal hole 13.

The two guide frames 2 are respectively disposed at the opposite uppercorners of a front plate 6, extending backward and vertically to form aU shaped body having an inner side bored with a through channel 21extending backward and slanting upward to correspond with the pivotalhole 13 of the main frame 1.

The two pivotal wheels 3 respectively employed for pivotally connectingthe guide frame 2 with the longitudinal rod 11 of the main frame 1 arerespectively provided with a wheel shaft 31 to be inserted through thechannel 21 of the guide frame 2 and secured in the pivotal hole 13 ofthe longitudinal rod 11, letting the wheel shaft 31 received in theguide frame 2 to be actuated to shift and operate therein.

The two leg frames 4 are respectively and pivotally assembled betweenthe rear side of the front plate 6 and the guide frames 2 by means ofhinges 41, respectively having an upper side bored with a plurality offitting slots 42 to be respectively engaged with the projections 12 ofthe longitudinal rods 1 of the main frame 1.

To stretch the collapsible desk for use, referring to FIG. 2, the legframes 4, with the hinges 41 serving as pivots, are respectivelyexpanded outward along the front plate 6 to have the projections 12 ofthe longitudinal rods 11 of the main frame 1 respectively fitted in thefitting slots 42 of the leg frames 4. Thus, the leg frames 4 can supportthe longitudinal rods 11 and the main frame 1 together with the desk topplate 5 to finish assembling a stable stretched desk.

To collapse the desk, referring to FIGS. 3 and 4, firstly, thelongitudinal rods 11 together with the main frame 1 are pivotally turnedupward and moved backward along the channels 21 by means of the pivotalwheels 3 and at this time, the longitudinal rods 11 will be moved awayfrom the leg frames 4, and the engage projections 12 of the longitudinalrods 11 are respectively pulled out of the fitting slots 42 of the legframes 4, thus enabling the leg frames 4 to be collapsed inward andsuperposed on the rear side of the front plate 6. Then, the longitudinalrods 11 are pivotally turned downward again to let the main frame 1together with the desk top plate 5 superposed and covered on the legframes 4 to finish collapsing the desk, as shown in FIG. 5.

As can be understood from the above description, the collapsing deviceof a desk of this invention is much better than a conventional one inindustrial utilization, originality and practicability.

While the preferred embodiment of the invention has been describedabove, it will be recognized and understood that various modificationsmay be made therein and the appended claims are intended to cover allsuch modifications that may fall within the spirit and scope of theinvention.

1. A collapsing device for a desk comprising a main frame, two guideframes, two pivotal wheels and two leg frames; Said main frame securedat an underside of a desk top plate, said main frame provided with twolongitudinal rods respectively having a bottom side fixed thereon with aplurality of projections, said two longitudinal rods respectively havingan outer front end bored with a pivotal hole; Said two guide framesrespectively positioned at an upper corner of two opposite sides of afront plate and extending backward vertically to form a U-shaped body,said guide frame having an inner side bored with a through channelextending backward and slanting upward, said channel corresponding withsaid pivotal hole of said main frame; Said two pivotal wheels pivotallyconnecting said guide frames and said longitudinal rods of said mainframe, said two pivotal wheels respectively formed with a wheel shaftinserted through said channel of said guide frame and secured in saidpivotal hole of said longitudinal rod, said pivotal wheel received insaid channel of said guide frame and actuated to shift and operatetherein; and Said two leg frames pivotally assembled between a rear sideof said front plate and said guide frames, said two leg framesrespectively having an upper side bored with a plurality of fittingslots to be respectively fitted in by said projections of saidlongitudinal rods of said main frame.